L6360 datasheet(59/65 Pages) STMICROELECTRONICS

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L6360

EMC protection considerations

Doc ID 022817 Rev 2

59/65

Figure 45.

Refined supply voltage protection

The above reference diagram provides an extended level of protection in both polarities as

well as the reverse polarity protection.

If the VH pin of the L6360 is supplied from a separate power supply or if it is decoupled from

the main power supply and blocked by bulk capacitors, an additional circuit may be required

to ensure the VH voltage is always lower than (or equal to) the main supply voltage (VCC).

A possible solution with diode is shown in Figure 46.

Table 33.

Refined supply voltage protection component description

Part

Function

Description

D_PWR

Primary overvoltage

protection

Works as a primary overvoltage clamp to limit supply line

distortions - like surge pulses, oscillations caused by line

parasitic parameters (inductance) during plug-in phase, etc.

1500 W is recommended to provide reliable protection, uni-

directional type is chosen to cover reverse polarity protection.

D_POL

Reverse polarity protection

Avoids reverse direction current flow and negative voltage

stress of the L6360. Its current rating (3 A) is chosen in

accordance with the maximum driving capabilities of the

L6360 power stages. Schottky type is recommended to limit

power dissipation (low VF). Voltage rating (100 V) comes from

negative surge to the supply condition.

D_S

D_PWR support and IO

overvoltage protection

a) Shares a positive surge current with the primary protection

and limits the overvoltage amplitude.

b) clamps surges applied to the L6360 C/Q and L+ lines.

C_F

Filtering bulk capacitor

An energy buffer for application supply, filters the application

supply to avoid high ripple during power driver switching, etc.

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